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![Wolfram Sang](/assets/img/avatar_default.png)
The core will print out details now. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@linux-watchdog.org>
488 lines
12 KiB
C
488 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* sp5100_tco : TCO timer driver for sp5100 chipsets
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*
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* (c) Copyright 2009 Google Inc., All Rights Reserved.
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*
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* Based on i8xx_tco.c:
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* (c) Copyright 2000 kernel concepts <nils@kernelconcepts.de>, All Rights
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* Reserved.
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* http://www.kernelconcepts.de
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*
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* See AMD Publication 43009 "AMD SB700/710/750 Register Reference Guide",
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* AMD Publication 45482 "AMD SB800-Series Southbridges Register
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* Reference Guide"
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* AMD Publication 48751 "BIOS and Kernel Developer’s Guide (BKDG)
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* for AMD Family 16h Models 00h-0Fh Processors"
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* AMD Publication 51192 "AMD Bolton FCH Register Reference Guide"
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* AMD Publication 52740 "BIOS and Kernel Developer’s Guide (BKDG)
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* for AMD Family 16h Models 30h-3Fh Processors"
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*/
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/*
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* Includes, defines, variables, module parameters, ...
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/ioport.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/pci.h>
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#include <linux/platform_device.h>
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#include <linux/types.h>
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#include <linux/watchdog.h>
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#include "sp5100_tco.h"
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#define TCO_DRIVER_NAME "sp5100-tco"
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/* internal variables */
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enum tco_reg_layout {
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sp5100, sb800, efch
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};
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struct sp5100_tco {
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struct watchdog_device wdd;
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void __iomem *tcobase;
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enum tco_reg_layout tco_reg_layout;
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};
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/* the watchdog platform device */
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static struct platform_device *sp5100_tco_platform_device;
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/* the associated PCI device */
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static struct pci_dev *sp5100_tco_pci;
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/* module parameters */
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#define WATCHDOG_HEARTBEAT 60 /* 60 sec default heartbeat. */
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static int heartbeat = WATCHDOG_HEARTBEAT; /* in seconds */
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module_param(heartbeat, int, 0);
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MODULE_PARM_DESC(heartbeat, "Watchdog heartbeat in seconds. (default="
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__MODULE_STRING(WATCHDOG_HEARTBEAT) ")");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started."
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" (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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/*
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* Some TCO specific functions
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*/
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static enum tco_reg_layout tco_reg_layout(struct pci_dev *dev)
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{
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if (dev->vendor == PCI_VENDOR_ID_ATI &&
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dev->device == PCI_DEVICE_ID_ATI_SBX00_SMBUS &&
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dev->revision < 0x40) {
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return sp5100;
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} else if (dev->vendor == PCI_VENDOR_ID_AMD &&
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((dev->device == PCI_DEVICE_ID_AMD_HUDSON2_SMBUS &&
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dev->revision >= 0x41) ||
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(dev->device == PCI_DEVICE_ID_AMD_KERNCZ_SMBUS &&
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dev->revision >= 0x49))) {
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return efch;
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}
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return sb800;
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}
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static int tco_timer_start(struct watchdog_device *wdd)
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{
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struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
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u32 val;
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val = readl(SP5100_WDT_CONTROL(tco->tcobase));
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val |= SP5100_WDT_START_STOP_BIT;
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writel(val, SP5100_WDT_CONTROL(tco->tcobase));
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return 0;
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}
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static int tco_timer_stop(struct watchdog_device *wdd)
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{
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struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
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u32 val;
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val = readl(SP5100_WDT_CONTROL(tco->tcobase));
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val &= ~SP5100_WDT_START_STOP_BIT;
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writel(val, SP5100_WDT_CONTROL(tco->tcobase));
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return 0;
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}
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static int tco_timer_ping(struct watchdog_device *wdd)
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{
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struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
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u32 val;
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val = readl(SP5100_WDT_CONTROL(tco->tcobase));
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val |= SP5100_WDT_TRIGGER_BIT;
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writel(val, SP5100_WDT_CONTROL(tco->tcobase));
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return 0;
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}
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static int tco_timer_set_timeout(struct watchdog_device *wdd,
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unsigned int t)
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{
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struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
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/* Write new heartbeat to watchdog */
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writel(t, SP5100_WDT_COUNT(tco->tcobase));
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wdd->timeout = t;
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return 0;
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}
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static u8 sp5100_tco_read_pm_reg8(u8 index)
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{
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outb(index, SP5100_IO_PM_INDEX_REG);
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return inb(SP5100_IO_PM_DATA_REG);
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}
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static void sp5100_tco_update_pm_reg8(u8 index, u8 reset, u8 set)
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{
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u8 val;
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outb(index, SP5100_IO_PM_INDEX_REG);
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val = inb(SP5100_IO_PM_DATA_REG);
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val &= reset;
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val |= set;
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outb(val, SP5100_IO_PM_DATA_REG);
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}
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static void tco_timer_enable(struct sp5100_tco *tco)
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{
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u32 val;
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switch (tco->tco_reg_layout) {
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case sb800:
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/* For SB800 or later */
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/* Set the Watchdog timer resolution to 1 sec */
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sp5100_tco_update_pm_reg8(SB800_PM_WATCHDOG_CONFIG,
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0xff, SB800_PM_WATCHDOG_SECOND_RES);
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/* Enable watchdog decode bit and watchdog timer */
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sp5100_tco_update_pm_reg8(SB800_PM_WATCHDOG_CONTROL,
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~SB800_PM_WATCHDOG_DISABLE,
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SB800_PCI_WATCHDOG_DECODE_EN);
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break;
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case sp5100:
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/* For SP5100 or SB7x0 */
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/* Enable watchdog decode bit */
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pci_read_config_dword(sp5100_tco_pci,
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SP5100_PCI_WATCHDOG_MISC_REG,
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&val);
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val |= SP5100_PCI_WATCHDOG_DECODE_EN;
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pci_write_config_dword(sp5100_tco_pci,
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SP5100_PCI_WATCHDOG_MISC_REG,
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val);
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/* Enable Watchdog timer and set the resolution to 1 sec */
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sp5100_tco_update_pm_reg8(SP5100_PM_WATCHDOG_CONTROL,
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~SP5100_PM_WATCHDOG_DISABLE,
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SP5100_PM_WATCHDOG_SECOND_RES);
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break;
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case efch:
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/* Set the Watchdog timer resolution to 1 sec and enable */
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sp5100_tco_update_pm_reg8(EFCH_PM_DECODEEN3,
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~EFCH_PM_WATCHDOG_DISABLE,
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EFCH_PM_DECODEEN_SECOND_RES);
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break;
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}
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}
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static u32 sp5100_tco_read_pm_reg32(u8 index)
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{
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u32 val = 0;
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int i;
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for (i = 3; i >= 0; i--)
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val = (val << 8) + sp5100_tco_read_pm_reg8(index + i);
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return val;
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}
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static int sp5100_tco_setupdevice(struct device *dev,
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struct watchdog_device *wdd)
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{
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struct sp5100_tco *tco = watchdog_get_drvdata(wdd);
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const char *dev_name;
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u32 mmio_addr = 0, val;
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int ret;
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/* Request the IO ports used by this driver */
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if (!request_muxed_region(SP5100_IO_PM_INDEX_REG,
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SP5100_PM_IOPORTS_SIZE, "sp5100_tco")) {
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dev_err(dev, "I/O address 0x%04x already in use\n",
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SP5100_IO_PM_INDEX_REG);
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return -EBUSY;
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}
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/*
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* Determine type of southbridge chipset.
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*/
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switch (tco->tco_reg_layout) {
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case sp5100:
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dev_name = SP5100_DEVNAME;
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mmio_addr = sp5100_tco_read_pm_reg32(SP5100_PM_WATCHDOG_BASE) &
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0xfffffff8;
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break;
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case sb800:
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dev_name = SB800_DEVNAME;
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mmio_addr = sp5100_tco_read_pm_reg32(SB800_PM_WATCHDOG_BASE) &
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0xfffffff8;
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break;
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case efch:
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dev_name = SB800_DEVNAME;
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val = sp5100_tco_read_pm_reg8(EFCH_PM_DECODEEN);
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if (val & EFCH_PM_DECODEEN_WDT_TMREN)
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mmio_addr = EFCH_PM_WDT_ADDR;
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break;
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default:
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return -ENODEV;
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}
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/* Check MMIO address conflict */
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if (!mmio_addr ||
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!devm_request_mem_region(dev, mmio_addr, SP5100_WDT_MEM_MAP_SIZE,
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dev_name)) {
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if (mmio_addr)
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dev_dbg(dev, "MMIO address 0x%08x already in use\n",
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mmio_addr);
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switch (tco->tco_reg_layout) {
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case sp5100:
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/*
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* Secondly, Find the watchdog timer MMIO address
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* from SBResource_MMIO register.
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*/
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/* Read SBResource_MMIO from PCI config(PCI_Reg: 9Ch) */
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pci_read_config_dword(sp5100_tco_pci,
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SP5100_SB_RESOURCE_MMIO_BASE,
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&mmio_addr);
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if ((mmio_addr & (SB800_ACPI_MMIO_DECODE_EN |
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SB800_ACPI_MMIO_SEL)) !=
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SB800_ACPI_MMIO_DECODE_EN) {
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ret = -ENODEV;
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goto unreg_region;
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}
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mmio_addr &= ~0xFFF;
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mmio_addr += SB800_PM_WDT_MMIO_OFFSET;
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break;
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case sb800:
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/* Read SBResource_MMIO from AcpiMmioEn(PM_Reg: 24h) */
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mmio_addr =
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sp5100_tco_read_pm_reg32(SB800_PM_ACPI_MMIO_EN);
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if ((mmio_addr & (SB800_ACPI_MMIO_DECODE_EN |
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SB800_ACPI_MMIO_SEL)) !=
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SB800_ACPI_MMIO_DECODE_EN) {
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ret = -ENODEV;
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goto unreg_region;
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}
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mmio_addr &= ~0xFFF;
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mmio_addr += SB800_PM_WDT_MMIO_OFFSET;
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break;
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case efch:
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val = sp5100_tco_read_pm_reg8(EFCH_PM_ISACONTROL);
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if (!(val & EFCH_PM_ISACONTROL_MMIOEN)) {
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ret = -ENODEV;
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goto unreg_region;
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}
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mmio_addr = EFCH_PM_ACPI_MMIO_ADDR +
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EFCH_PM_ACPI_MMIO_WDT_OFFSET;
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break;
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}
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dev_dbg(dev, "Got 0x%08x from SBResource_MMIO register\n",
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mmio_addr);
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if (!devm_request_mem_region(dev, mmio_addr,
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SP5100_WDT_MEM_MAP_SIZE,
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dev_name)) {
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dev_dbg(dev, "MMIO address 0x%08x already in use\n",
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mmio_addr);
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ret = -EBUSY;
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goto unreg_region;
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}
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}
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tco->tcobase = devm_ioremap(dev, mmio_addr, SP5100_WDT_MEM_MAP_SIZE);
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if (!tco->tcobase) {
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dev_err(dev, "failed to get tcobase address\n");
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ret = -ENOMEM;
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goto unreg_region;
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}
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dev_info(dev, "Using 0x%08x for watchdog MMIO address\n", mmio_addr);
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/* Setup the watchdog timer */
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tco_timer_enable(tco);
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val = readl(SP5100_WDT_CONTROL(tco->tcobase));
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if (val & SP5100_WDT_DISABLED) {
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dev_err(dev, "Watchdog hardware is disabled\n");
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ret = -ENODEV;
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goto unreg_region;
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}
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/*
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* Save WatchDogFired status, because WatchDogFired flag is
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* cleared here.
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*/
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if (val & SP5100_WDT_FIRED)
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wdd->bootstatus = WDIOF_CARDRESET;
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/* Set watchdog action to reset the system */
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val &= ~SP5100_WDT_ACTION_RESET;
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writel(val, SP5100_WDT_CONTROL(tco->tcobase));
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/* Set a reasonable heartbeat before we stop the timer */
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tco_timer_set_timeout(wdd, wdd->timeout);
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/*
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* Stop the TCO before we change anything so we don't race with
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* a zeroed timer.
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*/
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tco_timer_stop(wdd);
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release_region(SP5100_IO_PM_INDEX_REG, SP5100_PM_IOPORTS_SIZE);
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return 0;
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unreg_region:
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release_region(SP5100_IO_PM_INDEX_REG, SP5100_PM_IOPORTS_SIZE);
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return ret;
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}
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static struct watchdog_info sp5100_tco_wdt_info = {
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.identity = "SP5100 TCO timer",
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.options = WDIOF_SETTIMEOUT | WDIOF_KEEPALIVEPING | WDIOF_MAGICCLOSE,
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};
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static const struct watchdog_ops sp5100_tco_wdt_ops = {
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.owner = THIS_MODULE,
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.start = tco_timer_start,
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.stop = tco_timer_stop,
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.ping = tco_timer_ping,
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.set_timeout = tco_timer_set_timeout,
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};
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static int sp5100_tco_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct watchdog_device *wdd;
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struct sp5100_tco *tco;
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int ret;
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tco = devm_kzalloc(dev, sizeof(*tco), GFP_KERNEL);
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if (!tco)
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return -ENOMEM;
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tco->tco_reg_layout = tco_reg_layout(sp5100_tco_pci);
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wdd = &tco->wdd;
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wdd->parent = dev;
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wdd->info = &sp5100_tco_wdt_info;
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wdd->ops = &sp5100_tco_wdt_ops;
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wdd->timeout = WATCHDOG_HEARTBEAT;
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wdd->min_timeout = 1;
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wdd->max_timeout = 0xffff;
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watchdog_init_timeout(wdd, heartbeat, NULL);
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watchdog_set_nowayout(wdd, nowayout);
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watchdog_stop_on_reboot(wdd);
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watchdog_stop_on_unregister(wdd);
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watchdog_set_drvdata(wdd, tco);
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ret = sp5100_tco_setupdevice(dev, wdd);
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if (ret)
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return ret;
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ret = devm_watchdog_register_device(dev, wdd);
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if (ret)
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return ret;
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/* Show module parameters */
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dev_info(dev, "initialized. heartbeat=%d sec (nowayout=%d)\n",
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wdd->timeout, nowayout);
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return 0;
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}
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static struct platform_driver sp5100_tco_driver = {
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.probe = sp5100_tco_probe,
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.driver = {
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.name = TCO_DRIVER_NAME,
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},
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};
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/*
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* Data for PCI driver interface
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*
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* This data only exists for exporting the supported
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* PCI ids via MODULE_DEVICE_TABLE. We do not actually
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* register a pci_driver, because someone else might
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* want to register another driver on the same PCI id.
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*/
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static const struct pci_device_id sp5100_tco_pci_tbl[] = {
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{ PCI_VENDOR_ID_ATI, PCI_DEVICE_ID_ATI_SBX00_SMBUS, PCI_ANY_ID,
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PCI_ANY_ID, },
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{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_HUDSON2_SMBUS, PCI_ANY_ID,
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PCI_ANY_ID, },
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{ PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_KERNCZ_SMBUS, PCI_ANY_ID,
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PCI_ANY_ID, },
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{ 0, }, /* End of list */
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};
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MODULE_DEVICE_TABLE(pci, sp5100_tco_pci_tbl);
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static int __init sp5100_tco_init(void)
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{
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struct pci_dev *dev = NULL;
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int err;
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/* Match the PCI device */
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for_each_pci_dev(dev) {
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if (pci_match_id(sp5100_tco_pci_tbl, dev) != NULL) {
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sp5100_tco_pci = dev;
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break;
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}
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}
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if (!sp5100_tco_pci)
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return -ENODEV;
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pr_info("SP5100/SB800 TCO WatchDog Timer Driver\n");
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err = platform_driver_register(&sp5100_tco_driver);
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if (err)
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return err;
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sp5100_tco_platform_device =
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platform_device_register_simple(TCO_DRIVER_NAME, -1, NULL, 0);
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if (IS_ERR(sp5100_tco_platform_device)) {
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err = PTR_ERR(sp5100_tco_platform_device);
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goto unreg_platform_driver;
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}
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return 0;
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unreg_platform_driver:
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platform_driver_unregister(&sp5100_tco_driver);
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return err;
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}
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static void __exit sp5100_tco_exit(void)
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{
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platform_device_unregister(sp5100_tco_platform_device);
|
||
platform_driver_unregister(&sp5100_tco_driver);
|
||
}
|
||
|
||
module_init(sp5100_tco_init);
|
||
module_exit(sp5100_tco_exit);
|
||
|
||
MODULE_AUTHOR("Priyanka Gupta");
|
||
MODULE_DESCRIPTION("TCO timer driver for SP5100/SB800 chipset");
|
||
MODULE_LICENSE("GPL");
|